Each service corresponds to a corresponding port. For example, as we all know, the port of WWW service is 80, smtp is 25 and ftp is 2 1. These services are started by default in win2000 installation. Individual users are really unnecessary. Closing a port means closing useless services. In the control panel "Administrative Tools" in "Services".

Port 139 is a NetBIOS session port, which is used for file and print * * *. Note that the unix machine running samba has also opened the port 139, which has the same function. In the past, streamer 2000 judged the type of the other host inaccurately. It is estimated that the port 139 is open, and it is considered as an NT machine. The way to turn off 139 listening is to select the Internet Protocol (TCP/IP) attribute in the LAN connection in the network and dial-up connection, enter the advanced TCP/IP settings and WINS settings, and there is an item "Disable NETBIOS of TCP/IP", and then tick off the 139 port. For individual users, it can be set to "Disabled" in various service attribute settings to avoid restarting the service and opening the port next time.